CAJ | 학술논문

为了给南澳多端柔性直流输电工程的调度运行提供指导，对南澳工程的运行特性及交直流相互影响进行了分析。首先介绍了南澳工程概况，分析柔直工程的故障穿越特性，明确主网哪些交流站点发生故障将导致柔直闭锁；其次探讨主网故障对风电场经柔直并网送出的影响，比较了纯直流运行方式与交直流并联方式在故障隔离方面的差异；最后研究了柔直在交直流并联方式运行时，交直流输电通道故障分别对供送电能力的影响。分析结果认为：主网侧交流系统故障可能导致柔直因充电过电压而闭锁，而交流侧故障造成直流电压的波动很小，因而柔性直流具有隔离故障的功能。
위료급남오다단유성직류수전공정적조도운행제공지도，대남오공정적운행특성급교직류상호영향진행료분석。수선개소료남오공정개황，분석유직공정적고장천월특성，명학주망나사교류참점발생고장장도치유직폐쇄；기차탐토주망고장대풍전장경유직병망송출적영향，비교료순직류운행방식여교직류병련방식재고장격리방면적차이；최후연구료유직재교직류병련방식운행시，교직류수전통도고장분별대공송전능력적영향。분석결과인위：주망측교류계통고장가능도치유직인충전과전압이폐쇄，이교류측고장조성직류전압적파동흔소，인이유성직류구유격리고장적공능。
In order to provide guidance for dispatching operation of Nan’ao multi-terminal flexible VSC-HVDC transmission engineering,this paper analyzes operation characteristic and AC/DC interaction of the engineering. It firstly introduces general situation of the Nan’ao engineering,analyzes fault ride-through of the engineering and confirms faults of AC station sites that may cause flexible HVDC interlock. Secondly,it discusses affect on wind power sending via flexible HVDC by fault of the main power grid and compares differences of pure DC operation mode and AC/DC parallel connection mode in fault isolation. At last,it studies affects on power supply and transmission capacities by faults of AC and DC power transmis-sion channels under AC/DC parallel connection mode. The analysis results consider that fault of AC system at the main grid side may causeinterlock of the flexible HVDC because of charging overvoltage,while the fault at AC side brings about little fluctuation of DC voltage,which indicates that flexible VSC-HVDC is provided with function of fault isolation.